diff options
Diffstat (limited to 'lib/dma-noncoherent.c')
| -rw-r--r-- | lib/dma-noncoherent.c | 102 |
1 files changed, 0 insertions, 102 deletions
diff --git a/lib/dma-noncoherent.c b/lib/dma-noncoherent.c deleted file mode 100644 index 79e9a757387f..000000000000 --- a/lib/dma-noncoherent.c +++ /dev/null | |||
| @@ -1,102 +0,0 @@ | |||
| 1 | // SPDX-License-Identifier: GPL-2.0 | ||
| 2 | /* | ||
| 3 | * Copyright (C) 2018 Christoph Hellwig. | ||
| 4 | * | ||
| 5 | * DMA operations that map physical memory directly without providing cache | ||
| 6 | * coherence. | ||
| 7 | */ | ||
| 8 | #include <linux/export.h> | ||
| 9 | #include <linux/mm.h> | ||
| 10 | #include <linux/dma-direct.h> | ||
| 11 | #include <linux/dma-noncoherent.h> | ||
| 12 | #include <linux/scatterlist.h> | ||
| 13 | |||
| 14 | static void dma_noncoherent_sync_single_for_device(struct device *dev, | ||
| 15 | dma_addr_t addr, size_t size, enum dma_data_direction dir) | ||
| 16 | { | ||
| 17 | arch_sync_dma_for_device(dev, dma_to_phys(dev, addr), size, dir); | ||
| 18 | } | ||
| 19 | |||
| 20 | static void dma_noncoherent_sync_sg_for_device(struct device *dev, | ||
| 21 | struct scatterlist *sgl, int nents, enum dma_data_direction dir) | ||
| 22 | { | ||
| 23 | struct scatterlist *sg; | ||
| 24 | int i; | ||
| 25 | |||
| 26 | for_each_sg(sgl, sg, nents, i) | ||
| 27 | arch_sync_dma_for_device(dev, sg_phys(sg), sg->length, dir); | ||
| 28 | } | ||
| 29 | |||
| 30 | static dma_addr_t dma_noncoherent_map_page(struct device *dev, struct page *page, | ||
| 31 | unsigned long offset, size_t size, enum dma_data_direction dir, | ||
| 32 | unsigned long attrs) | ||
| 33 | { | ||
| 34 | dma_addr_t addr; | ||
| 35 | |||
| 36 | addr = dma_direct_map_page(dev, page, offset, size, dir, attrs); | ||
| 37 | if (!dma_mapping_error(dev, addr) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) | ||
| 38 | arch_sync_dma_for_device(dev, page_to_phys(page) + offset, | ||
| 39 | size, dir); | ||
| 40 | return addr; | ||
| 41 | } | ||
| 42 | |||
| 43 | static int dma_noncoherent_map_sg(struct device *dev, struct scatterlist *sgl, | ||
| 44 | int nents, enum dma_data_direction dir, unsigned long attrs) | ||
| 45 | { | ||
| 46 | nents = dma_direct_map_sg(dev, sgl, nents, dir, attrs); | ||
| 47 | if (nents > 0 && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) | ||
| 48 | dma_noncoherent_sync_sg_for_device(dev, sgl, nents, dir); | ||
| 49 | return nents; | ||
| 50 | } | ||
| 51 | |||
| 52 | #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU | ||
| 53 | static void dma_noncoherent_sync_single_for_cpu(struct device *dev, | ||
| 54 | dma_addr_t addr, size_t size, enum dma_data_direction dir) | ||
| 55 | { | ||
| 56 | arch_sync_dma_for_cpu(dev, dma_to_phys(dev, addr), size, dir); | ||
| 57 | } | ||
| 58 | |||
| 59 | static void dma_noncoherent_sync_sg_for_cpu(struct device *dev, | ||
| 60 | struct scatterlist *sgl, int nents, enum dma_data_direction dir) | ||
| 61 | { | ||
| 62 | struct scatterlist *sg; | ||
| 63 | int i; | ||
| 64 | |||
| 65 | for_each_sg(sgl, sg, nents, i) | ||
| 66 | arch_sync_dma_for_cpu(dev, sg_phys(sg), sg->length, dir); | ||
| 67 | } | ||
| 68 | |||
| 69 | static void dma_noncoherent_unmap_page(struct device *dev, dma_addr_t addr, | ||
| 70 | size_t size, enum dma_data_direction dir, unsigned long attrs) | ||
| 71 | { | ||
| 72 | if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) | ||
| 73 | dma_noncoherent_sync_single_for_cpu(dev, addr, size, dir); | ||
| 74 | } | ||
| 75 | |||
| 76 | static void dma_noncoherent_unmap_sg(struct device *dev, struct scatterlist *sgl, | ||
| 77 | int nents, enum dma_data_direction dir, unsigned long attrs) | ||
| 78 | { | ||
| 79 | if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) | ||
| 80 | dma_noncoherent_sync_sg_for_cpu(dev, sgl, nents, dir); | ||
| 81 | } | ||
| 82 | #endif | ||
| 83 | |||
| 84 | const struct dma_map_ops dma_noncoherent_ops = { | ||
| 85 | .alloc = arch_dma_alloc, | ||
| 86 | .free = arch_dma_free, | ||
| 87 | .mmap = arch_dma_mmap, | ||
| 88 | .sync_single_for_device = dma_noncoherent_sync_single_for_device, | ||
| 89 | .sync_sg_for_device = dma_noncoherent_sync_sg_for_device, | ||
| 90 | .map_page = dma_noncoherent_map_page, | ||
| 91 | .map_sg = dma_noncoherent_map_sg, | ||
| 92 | #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU | ||
| 93 | .sync_single_for_cpu = dma_noncoherent_sync_single_for_cpu, | ||
| 94 | .sync_sg_for_cpu = dma_noncoherent_sync_sg_for_cpu, | ||
| 95 | .unmap_page = dma_noncoherent_unmap_page, | ||
| 96 | .unmap_sg = dma_noncoherent_unmap_sg, | ||
| 97 | #endif | ||
| 98 | .dma_supported = dma_direct_supported, | ||
| 99 | .mapping_error = dma_direct_mapping_error, | ||
| 100 | .cache_sync = arch_dma_cache_sync, | ||
| 101 | }; | ||
| 102 | EXPORT_SYMBOL(dma_noncoherent_ops); | ||